Valve-housing or handle-lock for pneumatic tools



A. LEVEDAHL. VALVE HOUSING 0R HANDLE LOOK FOR PNEUMATIC 1001s.

Patented July 19, 1921.

A T Q To all LU/1.0727. 2'25 may concern:

Be it known that I, AXEL citizen of the United States, .1 urora, of K 01' Ill.

LEVEDAI-IL, a resldm at ane and a specification.

n pneumatic tools, the valve housing or handle, as the case may be, has screw-threaded connection with one end of the barrel, and locking preventing loose under t e parts are subjected while the use.

This invention relates to such locking deobjects to improve to provide in 7 locking device which will efiiciently perform the function for which it is designed.

In the accompanying drawings illustrating a locking device of my invention- Figure 1 is a side elevational View of a pneumatic sand rammer provided with such locking device;

Fig. 2 is an enlarged fragmentary longitudinal sectional view taken on line 22 of Fig. l; and

Fig. 3 is a transverse sectional on line 3-3 of *ig. 2.

In the drawings, I have shown the locking device of my invention applied to a p matiic sand rammer of the floor type, such as described and claimed in my (o-pending application Serial No. 314,374, filed July 30, 1919, and of which the present application is a division.

As shown herein, said tool has a barrel and a valve housing. or head 2 ing View taken controlled by a his valve is held normally closed by a spring and moved into open position b means of a lever 4 pivoted on the outside of tie stem. The barrel has a b in projecting through box 7 e outer end of said barrel, as illustrated in Fi 1. The stuifi g has s uc ure is descri ed and claimed Specification of Letters Patent. Application filed June 1,

Patented July 19, 1921. 1920. Serial No. 385,438.

in my co-pcnding application filed May 27, .1920, Serial No. 384,515. To the outer end 0.. this rod is applied a Stamper r peen 8. The barrel has the usual passage 9, 9 (Fig. 2) for the operating fluid, the admission and exhaust of which to and from the barrel for reciprocating the piston and its connected rod. being rontrolled by a distrilmting valve not shown) of the differential pressure area type, located in the head 2.

s shown in, Fig. head 2 has the barrell rotation or turning relatively to each other. a locking device of i and constructed 1 is provided adannular rib 10. Surrounding the barrel between the rib and head 2 is a ring 11 rotatably and slidably mounted on the barrel. Interposed between his ring and the head 2 is a coiled expansion spring 12 having several turns about the barrel and having its ends bent in opposite directions to enter pockets 13, 13 in the ring and head, respectively, as shown in ig. 1 This connects such parts g but permits the parts to be disconnected when desired to separate them for any purpose. k opposed to the rib is aplurality of ratchet teeth 14, 14, between any two of which the tooth 15 of a locking key 16 may engage to hold the ring against accidental rotation. Said key 16 is in the form of a plug having a circular base 17 seated to rotate in a socket 18 in the barrel at the rib 11. as shown in Figs. 2 and 3. The key has a slotted head 19 by means of which it may be turned or rotated by a screwdriver or the like to release its tooth .o from looking engagement with the ring o ring 11 is provided with a plurality of holes 20 for a spanner wrench or the like to turn the ring to increase or decrease the tension of the spring 12.

or member engagement with the ring, whereupon the head 2 may be unscrewed and the ring 11 and connected spring 12 will follow.

e locking races but a f struction, and serves to efficiently lock the barrel and head together and prevents the head and barrel from loosening by the yibrations to which the tool is subjected when in use. The ratchet teeth are undercut into the edge of the ring 11, thereby permitting the ring to overlap the base 17 of the key and retain it in its socket 18. Furthermore, the key does not project beyond the barrel a greater distance than the ring and may therefore be flush with the same to prevent the key from interfering in any way with the use of the tool. The spring 12 is coiled to exert a constant force on the head 2 in a di rection to screw the head on the barrel, and thus hold the head from turning on the barrel in the opposite direction to unscrew it. i The spring takes up any looseness likely to be produced in the connection between the head and the barrel, and the force of the spring may be varied by turning the ring 11.

While I have shown and described my improved locking device as applied to a pnen matic sand rainmer, it is oi. course to be understood that the construction could be equally as well used for locking together the handle and barrel of a pneumatic tool of" any other type. Moreover, I do not wish to be confined to the exact details or construction and arrangement of parts shown, as they may be variously changed and modified without departing from the spirit and scope of my invention,

I claim as my invention:

1. In a pneumatic tool, the combination of a barrel, a valve housing having removable connection with said barrel at one end thereof, a ring rotatably and slidably mounted on said barrel, a rib on said barrel, a multiple looped spring encircling said barrel between said ring and said valve housing and having its ends bent in opposite directions and engaged with said housing and ring respectively, and a member for locking the ring against rotationon the barrel.

2. In a pneumatic tool, the combination of a barrel, a valve housing having screwthreaded connection with end thereof, a ring rotatably and slid-ably mounted on said barrel, provided with a plurality oi ratchet teeth, a multiple looped spring encirclingsaid barrel between said ring and said valve housing, and having its ends engaging both of the same, and a rotatable key on said barrel and having a tooth to engage the ratchet teeth on said ring.

3. In a pneumatic tool. the combination of a barrel, a member having threaded connection with said barrel at one end thereol, a rib on the barrel, a ring rotatably and slidably mounted on said barrel and having ratchet teeth in one edge thereof. a spring encircling said barrel between said ring and said member and having its ends bent in opposite directions and engaging in sockets in said member and ring, respectively. and a key having a base rotatably seated in a recess in said barrel at said rib and overlapped by said ring, said her having a tooth to engage the ratchet teeth on said ring.

4;. In a pneumatic tool, the eonibiiuition of a barrel, a member having threaded connection with said barrel at one end thereo'l. a rib on the barrel, a ring rotatably and slid ably mounted on said barrel and having ratchet teeth in one edge thereof, a spring: encircling said barrel between said ring and said member and having its ends bent in opposite directions and engaging in sockets in said member and ring, respectively, and a key having an integral base and haul, the former being rotatably seated in a recess in said barrel at said rib and overlapped by said ring, and said head having a tooth to engage the ratchet teeth on said ring and provided with a slot to permit turning of said key.

In testimony that I (Jldlll'l the foregoing as my invention, I ailir; my signature, this ill day of May, A. D. 1920.

AXEL LEVIQDAIIL.

said barrel at one i 

